diff options
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/Kconfig | 2 | ||||
| -rw-r--r-- | arch/mips/cavium-octeon/Makefile | 4 | ||||
| -rw-r--r-- | arch/mips/cavium-octeon/dma-octeon.c | 311 | ||||
| -rw-r--r-- | arch/mips/cavium-octeon/executive/Makefile | 1 | ||||
| -rw-r--r-- | arch/mips/cavium-octeon/executive/cvmx-helper-errata.c | 70 | ||||
| -rw-r--r-- | arch/mips/cavium-octeon/executive/cvmx-helper-jtag.c | 144 | ||||
| -rw-r--r-- | arch/mips/cavium-octeon/msi.c | 288 | ||||
| -rw-r--r-- | arch/mips/cavium-octeon/octeon-irq.c | 2 | ||||
| -rw-r--r-- | arch/mips/cavium-octeon/pci-common.c | 137 | ||||
| -rw-r--r-- | arch/mips/cavium-octeon/pci-common.h | 39 | ||||
| -rw-r--r-- | arch/mips/cavium-octeon/pci.c | 568 | ||||
| -rw-r--r-- | arch/mips/cavium-octeon/pcie.c | 1370 | ||||
| -rw-r--r-- | arch/mips/include/asm/octeon/cvmx-helper-errata.h | 33 | ||||
| -rw-r--r-- | arch/mips/include/asm/octeon/cvmx-helper-jtag.h | 43 | ||||
| -rw-r--r-- | arch/mips/include/asm/octeon/cvmx.h | 12 | ||||
| -rw-r--r-- | arch/mips/include/asm/octeon/octeon.h | 2 |
16 files changed, 3024 insertions, 2 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 25f3b0a11ca..96f05e588f4 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -618,6 +618,8 @@ config CAVIUM_OCTEON_REFERENCE_BOARD select SYS_HAS_EARLY_PRINTK select SYS_HAS_CPU_CAVIUM_OCTEON select SWAP_IO_SPACE + select HW_HAS_PCI + select ARCH_SUPPORTS_MSI help This option supports all of the Octeon reference boards from Cavium Networks. It builds a kernel that dynamically determines the Octeon diff --git a/arch/mips/cavium-octeon/Makefile b/arch/mips/cavium-octeon/Makefile index d6903c3f3d5..7c0528b0e34 100644 --- a/arch/mips/cavium-octeon/Makefile +++ b/arch/mips/cavium-octeon/Makefile @@ -14,5 +14,9 @@ obj-y += dma-octeon.o flash_setup.o obj-y += octeon-memcpy.o obj-$(CONFIG_SMP) += smp.o +obj-$(CONFIG_PCI) += pci-common.o +obj-$(CONFIG_PCI) += pci.o +obj-$(CONFIG_PCI) += pcie.o +obj-$(CONFIG_PCI_MSI) += msi.o EXTRA_CFLAGS += -Werror diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c index 01b1ef94b36..627c162a615 100644 --- a/arch/mips/cavium-octeon/dma-octeon.c +++ b/arch/mips/cavium-octeon/dma-octeon.c @@ -13,20 +13,327 @@ */ #include <linux/types.h> #include <linux/mm.h> +#include <linux/module.h> +#include <linux/string.h> +#include <linux/dma-mapping.h> +#include <linux/platform_device.h> +#include <linux/scatterlist.h> + +#include <linux/cache.h> +#include <linux/io.h> + +#include <asm/octeon/octeon.h> +#include <asm/octeon/cvmx-npi-defs.h> +#include <asm/octeon/cvmx-pci-defs.h> #include <dma-coherence.h> +#ifdef CONFIG_PCI +#include "pci-common.h" +#endif + +#define BAR2_PCI_ADDRESS 0x8000000000ul + +struct bar1_index_state { + int16_t ref_count; /* Number of PCI mappings using this index */ + uint16_t address_bits; /* Upper bits of physical address. This is + shifted 22 bits */ +}; + +#ifdef CONFIG_PCI +static DEFINE_SPINLOCK(bar1_lock); +static struct bar1_index_state bar1_state[32]; +#endif + dma_addr_t octeon_map_dma_mem(struct device *dev, void *ptr, size_t size) { +#ifndef CONFIG_PCI /* Without PCI/PCIe this function can be called for Octeon internal devices such as USB. These devices all support 64bit addressing */ mb(); return virt_to_phys(ptr); +#else + unsigned long flags; + uint64_t dma_mask; + int64_t start_index; + dma_addr_t result = -1; + uint64_t physical = virt_to_phys(ptr); + int64_t index; + + mb(); + /* + * Use the DMA masks to determine the allowed memory + * region. For us it doesn't limit the actual memory, just the + * address visible over PCI. Devices with limits need to use + * lower indexed Bar1 entries. + */ + if (dev) { + dma_mask = dev->coherent_dma_mask; + if (dev->dma_mask) + dma_mask = *dev->dma_mask; + } else { + dma_mask = 0xfffffffful; + } + + /* + * Platform devices, such as the internal USB, skip all + * translation and use Octeon physical addresses directly. + */ + if (!dev || dev->bus == &platform_bus_type) + return physical; + + switch (octeon_dma_bar_type) { + case OCTEON_DMA_BAR_TYPE_PCIE: + if (unlikely(physical < (16ul << 10))) + panic("dma_map_single: Not allowed to map first 16KB." + " It interferes with BAR0 special area\n"); + else if ((physical + size >= (256ul << 20)) && + (physical < (512ul << 20))) + panic("dma_map_single: Not allowed to map bootbus\n"); + else if ((physical + size >= 0x400000000ull) && + physical < 0x410000000ull) + panic("dma_map_single: " + "Attempt to map illegal memory address 0x%llx\n", + physical); + else if (physical >= 0x420000000ull) + panic("dma_map_single: " + "Attempt to map illegal memory address 0x%llx\n", + physical); + else if ((physical + size >= + (4ull<<30) - (OCTEON_PCI_BAR1_HOLE_SIZE<<20)) + && physical < (4ull<<30)) + pr_warning("dma_map_single: Warning: " + "Mapping memory address that might " + "conflict with devices 0x%llx-0x%llx\n", + physical, physical+size-1); + /* The 2nd 256MB is mapped at 256<<20 instead of 0x410000000 */ + if ((physical >= 0x410000000ull) && physical < 0x420000000ull) + result = physical - 0x400000000ull; + else + result = physical; + if (((result+size-1) & dma_mask) != result+size-1) + panic("dma_map_single: Attempt to map address " + "0x%llx-0x%llx, which can't be accessed " + "according to the dma mask 0x%llx\n", + physical, physical+size-1, dma_mask); + goto done; + + case OCTEON_DMA_BAR_TYPE_BIG: +#ifdef CONFIG_64BIT + /* If the device supports 64bit addressing, then use BAR2 */ + if (dma_mask > BAR2_PCI_ADDRESS) { + result = physical + BAR2_PCI_ADDRESS; + goto done; + } +#endif + if (unlikely(physical < (4ul << 10))) { + panic("dma_map_single: Not allowed to map first 4KB. " + "It interferes with BAR0 special area\n"); + } else if (physical < (256ul << 20)) { + if (unlikely(physical + size > (256ul << 20))) + panic("dma_map_single: Requested memory spans " + "Bar0 0:256MB and bootbus\n"); + result = physical; + goto done; + } else if (unlikely(physical < (512ul << 20))) { + panic("dma_map_single: Not allowed to map bootbus\n"); + } else if (physical < (2ul << 30)) { + if (unlikely(physical + size > (2ul << 30))) + panic("dma_map_single: Requested memory spans " + "Bar0 512MB:2GB and BAR1\n"); + result = physical; + goto done; + } else if (physical < (2ul << 30) + (128 << 20)) { + /* Fall through */ + } else if (physical < + (4ul << 30) - (OCTEON_PCI_BAR1_HOLE_SIZE << 20)) { + if (unlikely + (physical + size > + (4ul << 30) - (OCTEON_PCI_BAR1_HOLE_SIZE << 20))) + panic("dma_map_single: Requested memory " + "extends past Bar1 (4GB-%luMB)\n", + OCTEON_PCI_BAR1_HOLE_SIZE); + result = physical; + goto done; + } else if ((physical >= 0x410000000ull) && + (physical < 0x420000000ull)) { + if (unlikely(physical + size > 0x420000000ull)) + panic("dma_map_single: Requested memory spans " + "non existant memory\n"); + /* BAR0 fixed mapping 256MB:512MB -> + * 16GB+256MB:16GB+512MB */ + result = physical - 0x400000000ull; + goto done; + } else { + /* Continued below switch statement */ + } + break; + + case OCTEON_DMA_BAR_TYPE_SMALL: +#ifdef CONFIG_64BIT + /* If the device supports 64bit addressing, then use BAR2 */ + if (dma_mask > BAR2_PCI_ADDRESS) { + result = physical + BAR2_PCI_ADDRESS; + goto done; + } +#endif + /* Continued below switch statement */ + break; + + default: + panic("dma_map_single: Invalid octeon_dma_bar_type\n"); + } + + /* Don't allow mapping to span multiple Bar entries. The hardware guys + won't guarantee that DMA across boards work */ + if (unlikely((physical >> 22) != ((physical + size - 1) >> 22))) + panic("dma_map_single: " + "Requested memory spans more than one Bar1 entry\n"); + + if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG) + start_index = 31; + else if (unlikely(dma_mask < (1ul << 27))) + start_index = (dma_mask >> 22); + else + start_index = 31; + + /* Only one processor can access the Bar register at once */ + spin_lock_irqsave(&bar1_lock, flags); + + /* Look through Bar1 for existing mapping that will work */ + for (index = start_index; index >= 0; index--) { + if ((bar1_state[index].address_bits == physical >> 22) && + (bar1_state[index].ref_count)) { + /* An existing mapping will work, use it */ + bar1_state[index].ref_count++; + if (unlikely(bar1_state[index].ref_count < 0)) + panic("dma_map_single: " + "Bar1[%d] reference count overflowed\n", + (int) index); + result = (index << 22) | (physical & ((1 << 22) - 1)); + /* Large BAR1 is offset at 2GB */ + if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG) + result += 2ul << 30; + goto done_unlock; + } + } + + /* No existing mappings, look for a free entry */ + for (index = start_index; index >= 0; index--) { + if (unlikely(bar1_state[index].ref_count == 0)) { + union cvmx_pci_bar1_indexx bar1_index; + /* We have a free entry, use it */ + bar1_state[index].ref_count = 1; + bar1_state[index].address_bits = physical >> 22; + bar1_index.u32 = 0; + /* Address bits[35:22] sent to L2C */ + bar1_index.s.addr_idx = physical >> 22; + /* Don't put PCI accesses in L2. */ + bar1_index.s.ca = 1; + /* Endian Swap Mode */ + bar1_index.s.end_swp = 1; + /* Set '1' when the selected address range is valid. */ + bar1_index.s.addr_v = 1; + octeon_npi_write32(CVMX_NPI_PCI_BAR1_INDEXX(index), + bar1_index.u32); + /* An existing mapping will work, use it */ + result = (index << 22) | (physical & ((1 << 22) - 1)); + /* Large BAR1 is offset at 2GB */ + if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG) + result += 2ul << 30; + goto done_unlock; + } + } + + pr_err("dma_map_single: " + "Can't find empty BAR1 index for physical mapping 0x%llx\n", + (unsigned long long) physical); + +done_unlock: + spin_unlock_irqrestore(&bar1_lock, flags); +done: + pr_debug("dma_map_single 0x%llx->0x%llx\n", physical, result); + return result; +#endif } void octeon_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr) { - /* Without PCI/PCIe this function can be called for Octeon internal - * devices such as USB. These devices all support 64bit addressing */ +#ifndef CONFIG_PCI + /* + * Without PCI/PCIe this function can be called for Octeon internal + * devices such as USB. These devices all support 64bit addressing. + */ + return; +#else + unsigned long flags; + uint64_t index; + + /* + * Platform devices, such as the internal USB, skip all + * translation and use Octeon physical addresses directly. + */ + if (dev->bus == &platform_bus_type) + return; + + switch (octeon_dma_bar_type) { + case OCTEON_DMA_BAR_TYPE_PCIE: + /* Nothing to do, all mappings are static */ + goto done; + + case OCTEON_DMA_BAR_TYPE_BIG: +#ifdef CONFIG_64BIT + /* Nothing to do for addresses using BAR2 */ + if (dma_addr >= BAR2_PCI_ADDRESS) + goto done; +#endif + if (unlikely(dma_addr < (4ul << 10))) + panic("dma_unmap_single: Unexpect DMA address 0x%llx\n", + dma_addr); + else if (dma_addr < (2ul << 30)) + /* Nothing to do for addresses using BAR0 */ + goto done; + else if (dma_addr < (2ul << 30) + (128ul << 20)) + /* Need to unmap, fall through */ + index = (dma_addr - (2ul << 30)) >> 22; + else if (dma_addr < + (4ul << 30) - (OCTEON_PCI_BAR1_HOLE_SIZE << 20)) + goto done; /* Nothing to do for the rest of BAR1 */ + else + panic("dma_unmap_single: Unexpect DMA address 0x%llx\n", + dma_addr); + /* Continued below switch statement */ + break; + + case OCTEON_DMA_BAR_TYPE_SMALL: +#ifdef CONFIG_64BIT + /* Nothing to do for addresses using BAR2 */ + if (dma_addr >= BAR2_PCI_ADDRESS) + goto done; +#endif + index = dma_addr >> 22; + /* Continued below switch statement */ + break; + + default: + panic("dma_unmap_single: Invalid octeon_dma_bar_type\n"); + } + + if (unlikely(index > 31)) + panic("dma_unmap_single: " + "Attempt to unmap an invalid address (0x%llx)\n", + dma_addr); + + spin_lock_irqsave(&bar1_lock, flags); + bar1_state[index].ref_count--; + if (bar1_state[index].ref_count == 0) + octeon_npi_write32(CVMX_NPI_PCI_BAR1_INDEXX(index), 0); + else if (unlikely(bar1_state[index].ref_count < 0)) + panic("dma_unmap_single: Bar1[%u] reference count < 0\n", + (int) index); + spin_unlock_irqrestore(&bar1_lock, flags); +done: + pr_debug("dma_unmap_single 0x%llx\n", dma_addr); return; +#endif } diff --git a/arch/mips/cavium-octeon/executive/Makefile b/arch/mips/cavium-octeon/executive/Makefile index 80d6cb26766..2fd66db6939 100644 --- a/arch/mips/cavium-octeon/executive/Makefile +++ b/arch/mips/cavium-octeon/executive/Makefile @@ -11,3 +11,4 @@ obj-y += cvmx-bootmem.o cvmx-l2c.o cvmx-sysinfo.o octeon-model.o +obj-$(CONFIG_PCI) += cvmx-helper-errata.o cvmx-helper-jtag.o diff --git a/arch/mips/cavium-octeon/executive/cvmx-helper-errata.c b/arch/mips/cavium-octeon/executive/cvmx-helper-errata.c new file mode 100644 index 00000000000..8fb82057cd8 --- /dev/null +++ b/arch/mips/cavium-octeon/executive/cvmx-helper-errata.c @@ -0,0 +1,70 @@ +/***********************license start*************** + * Author: Cavium Networks + * + * Contact: support@caviumnetworks.com + * This file is part of the OCTEON SDK + * + * Copyright (c) 2003-2008 Cavium Networks + * + * This file is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, Version 2, as + * published by the Free Software Foundation. + * + * This file is distributed in the hope that it will be useful, but + * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or + * NONINFRINGEMENT. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this file; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * or visit http://www.gnu.org/licenses/. + * + * This file may also be available under a different license from Cavium. + * Contact Cavium Networks for more information + ***********************license end**************************************/ + +/** + * + * Fixes and workaround for Octeon chip errata. This file + * contains functions called by cvmx-helper to workaround known + * chip errata. For the most part, code doesn't need to call + * these functions directly. + * + */ +#include <asm/octeon/octeon.h> + +#include <asm/octeon/cvmx-helper-jtag.h> + +/** + * Due to errata G-720, the 2nd order CDR circuit on CN52XX pass + * 1 doesn't work properly. The following code disables 2nd order + * CDR for the specified QLM. + * + * @qlm: QLM to disable 2nd order CDR for. + */ +void __cvmx_helper_errata_qlm_disable_2nd_order_cdr(int qlm) +{ + int lane; + cvmx_helper_qlm_jtag_init(); + /* We need to load all four lanes of the QLM, a total of 1072 bits */ + for (lane = 0; lane < 4; lane++) { + /* + * Each lane has 268 bits. We need to set + * cfg_cdr_incx<67:64> = 3 and cfg_cdr_secord<77> = + * 1. All other bits are zero. Bits go in LSB first, + * so start off with the zeros for bits <63:0>. + */ + cvmx_helper_qlm_jtag_shift_zeros(qlm, 63 - 0 + 1); + /* cfg_cdr_incx<67:64>=3 */ + cvmx_helper_qlm_jtag_shift(qlm, 67 - 64 + 1, 3); + /* Zeros for bits <76:68> */ + cvmx_helper_qlm_jtag_shift_zeros(qlm, 76 - 68 + 1); + /* cfg_cdr_secord<77>=1 */ + cvmx_helper_qlm_jtag_shift(qlm, 77 - 77 + 1, 1); + /* Zeros for bits <267:78> */ + cvmx_helper_qlm_jtag_shift_zeros(qlm, 267 - 78 + 1); + } + cvmx_helper_qlm_jtag_update(qlm); +} diff --git a/arch/mips/cavium-octeon/executive/cvmx-helper-jtag.c b/arch/mips/cavium-octeon/executive/cvmx-helper-jtag.c new file mode 100644 index 00000000000..c1c54890bae --- /dev/null +++ b/arch/mips/cavium-octeon/executive/cvmx-helper-jtag.c @@ -0,0 +1,144 @@ + +/***********************license start*************** + * Author: Cavium Networks + * + * Contact: support@caviumnetworks.com + * This file is part of the OCTEON SDK + * + * Copyright (c) 2003-2008 Cavium Networks + * + * This file is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, Version 2, as + * published by the Free Software Foundation. + * + * This file is distributed in the hope that it will be useful, but + * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or + * NONINFRINGEMENT. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this file; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * or visit http://www.gnu.org/licenses/. + * + * This file may also be available under a different license from Cavium. + * Contact Cavium Networks for more information + ***********************license end**************************************/ + +/** + * + * Helper utilities for qlm_jtag. + * + */ + +#include <asm/octeon/octeon.h> +#include <asm/octeon/cvmx-helper-jtag.h> + + +/** + * Initialize the internal QLM JTAG logic to allow programming + * of the JTAG chain by the cvmx_helper_qlm_jtag_*() functions. + * These functions should only be used at the direction of Cavium + * Networks. Programming incorrect values into the JTAG chain + * can cause chip damage. + */ +void cvmx_helper_qlm_jtag_init(void) +{ + union cvmx_ciu_qlm_jtgc jtgc; + uint32_t clock_div = 0; + uint32_t divisor = cvmx_sysinfo_get()->cpu_clock_hz / (25 * 1000000); + divisor = (divisor - 1) >> 2; + /* Convert the divisor into a power of 2 shift */ + while (divisor) { + clock_div++; + divisor = divisor >> 1; + } + + /* + * Clock divider for QLM JTAG operations. eclk is divided by + * 2^(CLK_DIV + 2) + */ + jtgc.u64 = 0; + jtgc.s.clk_div = clock_div; + jtgc.s.mux_sel = 0; + if (OCTEON_IS_MODEL(OCTEON_CN52XX)) + jtgc.s.bypass = 0x3; + else + jtgc.s.bypass = 0xf; + cvmx_write_csr(CVMX_CIU_QLM_JTGC, jtgc.u64); + cvmx_read_csr(CVMX_CIU_QLM_JTGC); +} + +/** + * Write up to 32bits into the QLM jtag chain. Bits are shifted + * into the MSB and out the LSB, so you should shift in the low + * order bits followed by the high order bits. The JTAG chain is + * 4 * 268 bits long, or 1072. + * + * @qlm: QLM to shift value into + * @bits: Number of bits to shift in (1-32). + * @data: Data to shift in. Bit 0 enters the chain first, followed by + * bit 1, etc. + * + * Returns The low order bits of the JTAG chain that shifted out of the + * circle. + */ +uint32_t cvmx_helper_qlm_jtag_shift(int qlm, int bits, uint32_t data) +{ + union cvmx_ciu_qlm_jtgd jtgd; + jtgd.u64 = 0; + jtgd.s.shift = 1; + jtgd.s.shft_cnt = bits - 1; + jtgd.s.shft_reg = data; + if (!OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X)) + jtgd.s.select = 1 << qlm; + cvmx_write_csr(CVMX_CIU_QLM_JTGD, jtgd.u64); + do { + jtgd.u64 = cvmx_read_csr(CVMX_CIU_QLM_JTGD); + } while (jtgd.s.shift); + return jtgd.s.shft_reg >> (32 - bits); +} + +/** + * Shift long sequences of zeros into the QLM JTAG chain. It is + * common to need to shift more than 32 bits of zeros into the + * chain. This function is a convience wrapper around + * cvmx_helper_qlm_jtag_shift() to shift more than 32 bits of + * zeros at a time. + * + * @qlm: QLM to shift zeros into + * @bits: + */ +void cvmx_helper_qlm_jtag_shift_zeros(int qlm, int bits) +{ + while (bits > 0) { + int n = bits; + if (n > 32) + n = 32; + cvmx_helper_qlm_jtag_shift(qlm, n, 0); + bits -= n; + } +} + +/** + * Program the QLM JTAG chain into all lanes of the QLM. You must + * have already shifted in 268*4, or 1072 bits into the JTAG + * chain. Updating invalid values can possibly cause chip damage. + * + * @qlm: QLM to program + */ +void cvmx_helper_qlm_jtag_update(int qlm) +{ + union cvmx_ciu_qlm_jtgd jtgd; + + /* Update the new data */ + jtgd.u64 = 0; + jtgd.s.update = 1; + if (!OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X)) + jtgd.s.select = 1 << qlm; + cvmx_write_csr(CVMX_CIU_QLM_JTGD, jtgd.u64); + do { + jtgd.u64 = cvmx_read_csr(CVMX_CIU_QLM_JTGD); + } while (jtgd.s.update); +} diff --git a/arch/mips/cavium-octeon/msi.c b/arch/mips/cavium-octeon/msi.c new file mode 100644 index 00000000000..964b03b75a8 --- /dev/null +++ b/arch/mips/cavium-octeon/msi.c @@ -0,0 +1,288 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2005-2007 Cavium Networks + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/msi.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> + +#include <asm/octeon/octeon.h> +#include <asm/octeon/cvmx-npi-defs.h> +#include <asm/octeon/cvmx-pci-defs.h> +#include <asm/octeon/cvmx-npei-defs.h> +#include <asm/octeon/cvmx-pexp-defs.h> + +#include "pci-common.h" + +/* + * Each bit in msi_free_irq_bitmask represents a MSI interrupt that is + * in use. + */ +static uint64_t msi_free_irq_bitmask; + +/* + * Each bit in msi_multiple_irq_bitmask tells that the device using + * this bit in msi_free_irq_bitmask is also using the next bit. This + * is used so we can disable all of the MSI interrupts when a device + * uses multiple. + */ +static uint64_t msi_multiple_irq_bitmask; + +/* + * This lock controls updates to msi_free_irq_bitmask and + * msi_multiple_irq_bitmask. + */ +static DEFINE_SPINLOCK(msi_free_irq_bitmask_lock); + + +/** + * Called when a driver request MSI interrupts instead of the + * legacy INT A-D. This routine will allocate multiple interrupts + * for MSI devices that support them. A device can override this by + * programming the MSI control bits [6:4] before calling + * pci_enable_msi(). + * + * @param dev Device requesting MSI interrupts + * @param desc MSI descriptor + * + * Returns 0 on success. + */ +int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc) +{ + struct msi_msg msg; + uint16_t control; + int configured_private_bits; + int request_private_bits; + int irq; + int irq_step; + uint64_t search_mask; + + /* + * Read the MSI config to figure out how many IRQs this device + * wants. Most devices only want 1, which will give + * configured_private_bits and request_private_bits equal 0. + */ + pci_read_config_word(dev, desc->msi_attrib.pos + PCI_MSI_FLAGS, + &control); + + /* + * If the number of private bits has been configured then use + * that value instead of the requested number. This gives the + * driver the chance to override the number of interrupts + * before calling pci_enable_msi(). + */ + configured_private_bits = (control & PCI_MSI_FLAGS_QSIZE) >> 4; + if (configured_private_bits == 0) { + /* Nothing is configured, so use the hardware requested size */ + request_private_bits = (control & PCI_MSI_FLAGS_QMASK) >> 1; + } else { + /* + * Use the number of configured bits, assuming the + * driver wanted to override the hardware request + * value. + */ + request_private_bits = configured_private_bits; + } + + /* + * The PCI 2.3 spec mandates that there are at most 32 + * interrupts. If this device asks for more, only give it one. + */ + if (request_private_bits > 5) + request_private_bits = 0; + +try_only_one: + /* + * The IRQs have to be aligned on a power of two based on the + * number being requested. + */ + irq_step = 1 << request_private_bits; + + /* Mask with one bit for each IRQ */ + search_mask = (1 << irq_step) - 1; + + /* + * We're going to search msi_free_irq_bitmask_lock for zero + * bits. This represents an MSI interrupt number that isn't in + * use. + */ + spin_lock(&msi_free_irq_bitmask_lock); + for (irq = 0; irq < 64; irq += irq_step) { + if ((msi_free_irq_bitmask & (search_mask << irq)) == 0) { + msi_free_irq_bitmask |= search_mask << irq; + msi_multiple_irq_bitmask |= (search_mask >> 1) << irq; + break; + } + } + spin_unlock(&msi_free_irq_bitmask_lock); + + /* Make sure the search for available interrupts didn't fail */ + if (irq >= 64) { + if (request_private_bits) { + pr_err("arch_setup_msi_irq: Unable to find %d free " + "interrupts, trying just one", + 1 << request_private_bits); + request_private_bits = 0; + goto try_only_one; + } else + panic("arch_setup_msi_irq: Unable to find a free MSI " + "interrupt"); + } + + /* MSI interrupts start at logical IRQ OCTEON_IRQ_MSI_BIT0 */ + irq += OCTEON_IRQ_MSI_BIT0; + + switch (octeon_dma_bar_type) { + case OCTEON_DMA_BAR_TYPE_SMALL: + /* When not using big bar, Bar 0 is based at 128MB */ + msg.address_lo = + ((128ul << 20) + CVMX_PCI_MSI_RCV) & 0xffffffff; + msg.address_hi = ((128ul << 20) + CVMX_PCI_MSI_RCV) >> 32; + case OCTEON_DMA_BAR_TYPE_BIG: + /* When using big bar, Bar 0 is based at 0 */ + msg.address_lo = (0 + CVMX_PCI_MSI_RCV) & 0xffffffff; + msg.address_hi = (0 + CVMX_PCI_MSI_RCV) >> 32; + break; + case OCTEON_DMA_BAR_TYPE_PCIE: + /* When using PCIe, Bar 0 is based at 0 */ + /* FIXME CVMX_NPEI_MSI_RCV* other than 0? */ + msg.address_lo = (0 + CVMX_NPEI_PCIE_MSI_RCV) & 0xffffffff; + msg.address_hi = (0 + CVMX_NPEI_PCIE_MSI_RCV) >> 32; + break; + default: + panic("arch_setup_msi_irq: Invalid octeon_dma_bar_type\n"); + } + msg.data = irq - OCTEON_IRQ_MSI_BIT0; + + /* Update the number of IRQs the device has available to it */ + control &= ~PCI_MSI_FLAGS_QSIZE; + control |= request_private_bits << 4; + pci_write_config_word(dev, desc->msi_attrib.pos + PCI_MSI_FLAGS, + control); + + set_irq_msi(irq, desc); + write_msi_msg(irq, &msg); + return 0; +} + + +/** + * Called when a device no longer needs its MSI interrupts. All + * MSI interrupts for the device are freed. + * + * @irq: The devices first irq number. There may be multple in sequence. + */ +void arch_teardown_msi_irq(unsigned int irq) +{ + int number_irqs; + uint64_t bitmask; + + if ((irq < OCTEON_IRQ_MSI_BIT0) || (irq > OCTEON_IRQ_MSI_BIT63)) + panic("arch_teardown_msi_irq: Attempted to teardown illegal " + "MSI interrupt (%d)", irq); + irq -= OCTEON_IRQ_MSI_BIT0; + + /* + * Count the number of IRQs we need to free by looking at the + * msi_multiple_irq_bitmask. Each bit set means that the next + * IRQ is also owned by this device. + */ + number_irqs = 0; + while ((irq+number_irqs < 64) && + (msi_multiple_irq_bitmask & (1ull << (irq + number_irqs)))) + number_irqs++; + number_irqs++; + /* Mask with one bit for each IRQ */ + bitmask = (1 << number_irqs) - 1; + /* Shift the mask to the correct bit location */ + bitmask <<= irq; + if ((msi_free_irq_bitmask & bitmask) != bitmask) + panic("arch_teardown_msi_irq: Attempted to teardown MSI " + "interrupt (%d) not in use", irq); + + /* Checks are done, update the in use bitmask */ + spin_lock(&msi_free_irq_bitmask_lock); + msi_free_irq_bitmask &= ~bitmask; + msi_multiple_irq_bitmask &= ~bitmask; + spin_unlock(&msi_free_irq_bitmask_lock); +} + + +/** + * Called by the interrupt handling code when an MSI interrupt + * occurs. + * + * @param cpl + * @param dev_id + * + * @return + */ +static irqreturn_t octeon_msi_interrupt(int cpl, void *dev_id) +{ + uint64_t msi_bits; + int irq; + + if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_PCIE) + msi_bits = cvmx_read_csr(CVMX_PEXP_NPEI_MSI_RCV0); + else + msi_bits = cvmx_read_csr(CVMX_NPI_NPI_MSI_RCV); + irq = fls64(msi_bits); + if (irq) { + irq += OCTEON_IRQ_MSI_BIT0 - 1; + if (irq_desc[irq].action) { + do_IRQ(irq); + return IRQ_HANDLED; + } else { + pr_err("Spurious MSI interrupt %d\n", irq); + if (octeon_has_feature(OCTEON_FEATURE_PCIE)) { + /* These chips have PCIe */ + cvmx_write_csr(CVMX_PEXP_NPEI_MSI_RCV0, + 1ull << (irq - + OCTEON_IRQ_MSI_BIT0)); + } else { + /* These chips have PCI */ + cvmx_write_csr(CVMX_NPI_NPI_MSI_RCV, + 1ull << (irq - + OCTEON_IRQ_MSI_BIT0)); + } + } + } + return IRQ_NONE; +} + + +/** + * Initializes the MSI interrupt handling code + * + * @return + */ +int octeon_msi_initialize(void) +{ + int r; + if (octeon_has_feature(OCTEON_FEATURE_PCIE)) { + r = request_irq(OCTEON_IRQ_PCI_MSI0, octeon_msi_interrupt, + IRQF_SHARED, + "MSI[0:63]", octeon_msi_interrupt); + } else if (octeon_is_pci_host()) { + r = request_irq(OCTEON_IRQ_PCI_MSI0, octeon_msi_interrupt, + IRQF_SHARED, + "MSI[0:15]", octeon_msi_interrupt); + r += request_irq(OCTEON_IRQ_PCI_MSI1, octeon_msi_interrupt, + IRQF_SHARED, + "MSI[16:31]", octeon_msi_interrupt); + r += request_irq(OCTEON_IRQ_PCI_MSI2, octeon_msi_interrupt, + IRQF_SHARED, + "MSI[32:47]", octeon_msi_interrupt); + r += request_irq(OCTEON_IRQ_PCI_MSI3, octeon_msi_interrupt, + IRQF_SHARED, + "MSI[48:63]", octeon_msi_interrupt); + } + return 0; +} + +subsys_initcall(octeon_msi_initialize); diff --git a/arch/mips/cavium-octeon/octeon-irq.c b/arch/mips/cavium-octeon/octeon-irq.c index d3a0c8154be..8dfa009e007 100644 --- a/arch/mips/cavium-octeon/octeon-irq.c +++ b/arch/mips/cavium-octeon/octeon-irq.c @@ -10,6 +10,8 @@ #include <linux/hardirq.h> #include <asm/octeon/octeon.h> +#include <asm/octeon/cvmx-pexp-defs.h> +#include <asm/octeon/cvmx-npi-defs.h> DEFINE_RWLOCK(octeon_irq_ciu0_rwlock); DEFINE_RWLOCK(octeon_irq_ciu1_rwlock); diff --git a/arch/mips/cavium-octeon/pci-common.c b/arch/mips/cavium-octeon/pci-common.c new file mode 100644 index 00000000000..cd029f88da7 --- /dev/null +++ b/arch/mips/cavium-octeon/pci-common.c @@ -0,0 +1,137 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2005-2007 Cavium Networks + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/time.h> +#include <linux/delay.h> +#include "pci-common.h" + +typeof(pcibios_map_irq) *octeon_pcibios_map_irq; +enum octeon_dma_bar_type octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_INVALID; + +/** + * Map a PCI device to the appropriate interrupt line + * + * @param dev The Linux PCI device structure for the device to map + * @param slot The slot number for this device on __BUS 0__. Linux + * enumerates through all the bridges and figures out the + * slot on Bus 0 where this device eventually hooks to. + * @param pin The PCI interrupt pin read from the device, then swizzled + * as it goes through each bridge. + * @return Interrupt number for the device + */ +int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) +{ + if (octeon_pcibios_map_irq) + return octeon_pcibios_map_irq(dev, slot, pin); + else + panic("octeon_pcibios_map_irq doesn't point to a " + "pcibios_map_irq() function"); +} + + +/** + * Called to perform platform specific PCI setup + * + * @param dev + * @return + */ +int pcibios_plat_dev_init(struct pci_dev *dev) +{ + uint16_t config; + uint32_t dconfig; + int pos; + /* + * Force the Cache line setting to 64 bytes. |